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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cafd521f67e273a3a50eaf858242b4b8016ee47b9ce6807c39853f6d416d166' 
  AND token = 'Vfy6BXxwzcQT94VkLEv3xs6NdWPLV+5YA7Em+xrCrUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}